Shelf for a desk



FIG. 1 is a perspective view showing the rear, left side, and top of a shelf for a desk showing my new design;

FIG. 2 is an enlarged perspective view thereof;

FIG. 3 is a cross-sectional view taken through the center of the shelf; and,

FIG. 4 is a perspective view showing the rear, right side, and bottom thereof.

The desk, C-clamps, and rivets are shown in broken lines for illustrative purposes only and form no part of the claimed design.

The characteristic feature of the design resides in the application of a part having the appearance of an automotive spoiler to the shelf for a desk. 

The ornamental design for a shelf for a desk, as shown and described. 